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Research Papers

Evaluation of Protective La0.67Sr0.33MnO3–δ Coatings on Various Stainless Steels Used for Solid Oxide Fuel Cell Interconnects

[+] Author and Article Information
Jian-Jia Huang

Department of Mechanical Engineering,
National Central University,
Chung-li, 320 Taiwan, ROC

Chun-Lin Chu

National Nano Device Laboratories,
Hsinchu, 300 Taiwan ROC
e-mail: jenlen.boy@msa.hinet.net

Tien-Chan Chang

Institute of Nuclear Energy Research,
Longtan, Taoyuan 32546, Taiwan ROC

Shyong Lee

Department of Mechanical Engineering,
National Central University,
Chung-li, 320 Taiwan, R. O. C.

Jung-Yen Yang

National Nano Device Laboratories,
Hsinchu, 300 Taiwan R. O. C.

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY. Manuscript received October 2, 2012; final manuscript received December 19, 2012; published online March 21, 2013. Assoc. Editor: Masashi Mori.

J. Fuel Cell Sci. Technol 10(2), 021004 (Mar 21, 2013) (6 pages) Paper No: FC-12-1099; doi: 10.1115/1.4023579 History: Received October 02, 2012; Revised December 19, 2012

Four metallic alloys, namely 2205 duplex stainless steel (2205DSS), ZMG232, and stainless steels SS430 and SS304 are investigated for use as interconnects in solid oxide fuel cells (SOFCs). A La0.67Sr0.33MnO3–δ (LSMO) film is deposited on these metallic-alloy substrates using a pulsed-DC magnetron sputtering system in the reactive mode, leading to the formation of a cubic perovskite structure. The coated alloys are then subjected to oxidizing heat treatments in air at 600 °C, 700 °C, 800 °C, and 900 °C, and their microstructures as well as electrical resistances are evaluated. The electrical resistance measurements are performed at 800 °C, and the area-specific resistance (ASR) of the film-coated 2205DSS alloy is found to be less than that of the uncoated alloy. This is because a thick layer of Cr2O3 and a (Mn, Fe)Cr2O4 spinel phase layer are formed, and some divalent metallic ions migrate into the Cr2O3 layer. It is found that alloys coated with a thin film of LSMO are more suitable for use as metallic interconnects in SOFCs with intermediate-temperature operating ranges.

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Figures

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Fig. 1

The pulsed-dc magnetron sputtering system used in this study

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Fig. 2

Schematic drawing of the setup used for the resistivity measurements

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Fig. 3

X-ray diffraction patterns of the LSMO coatings on the surfaces of the oxidized alloys processed at different temperatures and for different times: (a) 2205DSS, (b) ZMG232, (c) SS430, and (d) SS304

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Fig. 4

SEM micrographs (depicting the surface morphologies) of the LSMO coated alloys: (a)–(d) SS304; (e)–(h) SS430, (i)–(l) ZMG232, and (m)–(p) 2205DSS after aging at 600 °C, 700 °C, and 800 °C for time periods ranging from 1 h to 200 h. The substrates shown in Figs. 4(a), 4(e), 4(i), and 4(m) were oxidized at 600 °C for 1 h in air; the substrates shown in Figs. 4(b), 4(f), 4(j), and 4(n) were oxidized at 700 °C for 1 h in air; the substrates shown in Figs. 4(c), 4(g), 4(k), and 4(o) were oxidized at 800 °C for 1 h in air; and the substrates shown in Figs. 4(d), 4(h), 4(i), and 4(p) were oxidized at 800 °C for 200 h in hot air.

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Fig. 5

SEM surface morphologies of LSMO coated (a) 2205DSS; (b) ZMG232; (c) SS430, and (d) SS304 oxidized at 1 h for 700 °C

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Fig. 6

Weight gain as function of oxidation time for 2205DSS alloys at 800 °C for 25 h in hot air

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Fig. 7

Micrographs of the oxide scales/alloy interface for (a) 2205DSS, (b) ZMG232, (c) SS430, and (d) SS304 after being oxidized at 800 °C for 200 h. Results of the EDS linear analysis of the cross-sectional areas are also included.

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Fig. 8

Area-specific resistance of the Fe-Cr based alloys as a function of temperature. The resistance is inversely proportional to the temperature.

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Fig. 9

Arrhenius plots of LSM-coated 2205DSS, ZMG232, SS430, and SS304 during heating at elevated temperatures in hot air

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